package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper  shoppingCartMapper;

    @Autowired
    private DishMapper  dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        // 判断当前加入购物车的商品是否已经存在
        //select * from shopping_cart where user_id=? and dish_id = ? and dish_flavor=?( or setmeal_id = ? )
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        // 如果已经存在，则数量number加1
        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);//update shopping_cart set number = ? where id = ?
            shoppingCartMapper.updateNumberById(cart);
        }else {
            // 如果不存在，则添加一条商品信息到购物车
            //判断添加的是菜品还是套餐

            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                //本次添加的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }



    }

    /**
     * 查看购物车数据，界面回显
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart sc = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(sc);
        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void clean() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    /**
     * 删除购物车中一个商品
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);

            Integer number = cart.getNumber();
            if(number ==1){
                //如果购物车数量为1，则直接删除当前记录即可
                shoppingCartMapper.deleteById(cart.getId());
            }else{
                //如果购物车数量大于1，则修改份数即可
                cart.setNumber(cart.getNumber()-1);
                shoppingCartMapper.updateNumberById(cart);
            }

        }

    }



}
